Question

You genetically engineer an Arabidopsis plant to have a mutation in gene B. Which of the following phenotypes would you expect to see as a result of this mutation?

A. petals - petals - stamen - stamen
B. sepals - petals - sepals - petals
C. sepals - petals - stamens - carpel
D. sepal - sepal - carpel - carpel
E. carpels - carpels - stamen - stamen

Answer 1

A mutation in the Class B gene of an Arabidopsis plant is expected to result in a phenotype of sepals-petals-sepals-petals. Mendel's experiments with pea plants indicate that seed texture was an observed characteristic and yellow seeds are dominant in F1 generation crosses.

Step-by-step explanation:

The question relates to the phenotypic outcome of a genetic mutation in an Arabidopsis plant, specifically for gene B. In the context of Arabidopsis floral pattern mutants, mutation in a Class B gene typically leads to the conversion of petals to sepals in the first and second whorls and stamens to carpels in the third and fourth whorls. Consequently, the expected phenotype would be B. sepals - petals - sepals - petals.

As for the genetics questions related to Mendel's pea plants, the expected outcomes are as follows:

1. One of the seven characteristics Mendel observed was seed texture (smooth versus wrinkled).
2. When crossing true-breeding green seed plants with those having yellow seeds, the F1 offspring will all have yellow seeds since yellow is dominant.